- Report of Foreign Issuer (6-K)

 

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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

Report of Foreign Issuer

Pursuant to Rule 13a-16 or 15d-16 of

the Securities Exchange Act of 1934

For the month of: JULY 2009

Commission File No:  001-13922

PETRO-CANADA

(Name of registrant)

150 - 6th Avenue S.W.

Calgary, Alberta

Canada T2P 3E3

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Form 20-F     _                                              Form 40-F      X   

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): __

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): __

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

Yes                                          No     X  

If "Yes" is marked, indicate the file number assigned to the registrant in connection with Rule 12g3-2(b):  82-__

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	PETRO-CANADA
Date:  July 22, 2009	/s/ Hugh L. Hooker
	Name:  Hugh L. Hooker
	Title:    Chief Compliance Officer, Corporate Secretary, Associate General Counsel

Exhibit Index

99.1           News Release - Suncor Energy and Petro-Canada merger receives Competition Bureau approval